Function add_blocker

pub fn add_blocker(surface: &WlSurface, blocker: impl Blocker + Send + 'static)

Available on crate feature wayland_frontend only.

Adds a blocker for the currently queued up state changes of the given surface.

Blockers will delay the pending state to be applied on the next commit until all of them return the state Released. Any blocker returning Cancelled will discard all changes.

The module will only evaluate blocker states on commit. If a blocker becomes ready later, a call to CompositorClientState::blocker_cleared is necessary to trigger a re-evaluation.